Machine



2 Sheets-Sheet 1.-

(No Model.)

G. 11. GA'RVIE.

SEWING MAUHINE.

Patented Feb. 6. 1883.

INVENTOR um 49 4M WITNESSESi 3 N o Mode 1.) 2 Sh eets Sheet 2..

G. D. GARVIE.

SEWING MACHINE.

No. 271,978. Patented Feb. 6,1883.

WITNESSES: Y INVENTOR u. FEI'ERS. Phalo-Umhognplur; wmin m. n. 1;.

UNITED STATE ATENT FFIoE.

eEoEeE D. GABVIE, on NEW YORK, N. Y.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 271,978, dated February6, 1888.

' Application filed June 23,1882. (No model.)

To all whom it may concern Be it known that I, GEORGE D. GARVIE, of thecity, county, and State of New York, have invented certain new anduseful Improvements in Sewing-Machines, of which the following is aspecification.

My invention has reference to that class of sewing-machines known asrevolving or oscillating hook machines; and it relates principally tothe manner of mounting and holding the bobbinholder and of controllingthe slack of the under thread. The bobbinholder is mounted in andcarried by thehook, but is prevented from rotating therewith by engagingthe feed-bar, which latter also imparts an oscillatory movement to thebobbinholder, with the effect of causing the latter to con'trol theslack of the under thread. It is this feature that principallycharacterizes my invention. Itcan best be explained and understood byreference to the accompanying drawings, in which Figure 1 is a frontelevation of so much of a sewing-machine as needed for the purposes ofexplanation, with the parts in the position which they assume when theneedle is descending and both threads are slack. Fig. 2 is a like viewof the same parts in the position, which they occupy whenthe needle isup and both threads are drawn taut. Fig. 3 is a transverse verticalcentral section ot' the revolving hook, its race, the bobbin-holder, &c.Fig. 4 is a plan of the same. Fig. 5 is an elevation designed to showthe take-up in the position which it occupies when the needle hascompleted its descent. Fig. 6 is a face view of the hook andbobbin-holder, with the lidof the latter raised. Fig. 7 is a face viewof the hook.

Fig. 8 is a face view of the bobbin-holder, with the cover or lidremoved and a part of one of the beads of the bobbin broken away. Fig. 9is a face view of the cover. Fig. 10 is a face view of the bobbin. Figs.1' to 5 are to some extent diagrammatic, it being deemed unnecessary toshow. a complete machine, including the mechanism by which the severalco-operating parts are actuated and driven.

A is the head of an ordinary sewing-machine of the Singer kind, with itsreciprocatory needle-bar a and needle b.

The line it represents the throat plate,

through which works a feed-bar, c, of the ordinary fourmotion type,which is to be mounted in the machine and actuated to move insubstantially the same way as any other ordinary four-motion feed-bar.

The cloth or work to be sewed is indicated at y.

The hook B is supported in a race, 0, so as to be capable of revolvingtherein, and is driven by a rotating or oscillating driver, D. The hookhas on its outer'face a cylindrical recess, (1, for the bobbin-holder, acentral stem, 0, rising from the bottom of the recess to form a stud onwhich the bobbin-holder may be centered. The bobbin-holder is a shell,E, mounted on said stud, with its open face outward, and held in placeby a retainingscrew,f, which is screwed into the end of the stude insuch a manner as not to interfere with the free movement of thebobbin-holder on the stud. Within the bobbin-holder, and upon thecentral hub thereof, is looselymounted a bobbin, F. In order to preventthe bobbinholder from following the movement of the hook, I provide itat the top, upon its outer face, with an extension-plate, E, whichextends up between the two arms or lugs 9, depending from the under sideof the feed-bar. arrangement the bobbin-holder not only is preventedfrom moving with the book, but also has imparted to it a movement of itsown, by which the slack of the under thread can be controlled. Thethreadchannel or slot for the under thread is formed in the extension-plate ath, and a spring, t, whose pressure is regulated by a set-screw, j,serves to regulate the tension. The thread-channel is so placed thatwhen the feed-bar is back, as indicated in Fig. 2, it will not be inline with the needle-hole in the throat-plate.

The action of the parts, so far as concerns controllingthe slack of theunder thread, is as follows: The feed-bar starts forward at the samemoment the needle-bar starts downward, and the upper and under threadsare thus relieved at the same time, as indicated in Fig. 1. On the otherhand, as the needle rises the feedbar moves back, and in so movingcarries with it the bobbin-holder from the position shown in Fig. 1 tothat represented in Fig. 2. The eifect of this will be to take up theslack of the By this.

under thread at the time the upper threadis being taken up, thus givingthe proper tension from above and below to the stitch.

The bobbin is covered by a lid, G, hinged at k to the extension-plateot'the bobbin-holder, and combined with a spring, 1, by which it is heldeither opened or closed. The extensionplate thus serves as both atension-bed and a support for the lid.

The take-up for the upper thread is shown in Figs. 1,2, and 5. It iscomposed of the oscillatory take-up arm H, which is arranged, timed inits movements, and actuated similary to the ordinary oscillating take-uparm.

It however difit'ers from the latter in being forked, each of its armson being provided with a thread-eye, n. The thread from the spool passesdown under disk or roll I, thence up through the first eye, a, thencedown through the loop or hook 0, which is attached to I, or the supportthereof, and is preferably formed upon the end of a spring armor strip,19, thence up through the second eye, at, and thence through suitableguides to the needle.

Having described my improvements, what I claim as new and of myinvention is-- l. The combination, with the hook and the feed bar, of afreely-moving bobbin holder mounted in and carried by the hook, andengaged by said feed-bar, so as to be thereby held from following therotary or oscillatory movement of said hook, substantially ashereinbefore set forth.

2. The combination, with the needle-bar and a take-up for the upperthread, the hook and the feed-bar, of a freely-moving bobbin-holdermounted in and carried by the hook, and engaged and operated by thefeed-bar to slacken and tighten the under thread at the times and in themanner substantially as hereinbefore set forth.

3. The bobbin-holder. provided with an adjustable tension plate orspring, and formed with an extension-plate which constitutes thetension-bed for the under thread and a hearing for the hinged lid orcover of said holder, in combination with the hook and the feedbar,provided with lugs or flanges to engage said extension-plate,substantially as and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 20th day of June,A. D. 1882.

GEO. D. GARVIE.

